feat(tags): enforce role imports carry their role-name tag

Adds role_tag_problems() to check-tags.py: every role imported in a
play's roles: block must carry its own role name as a tag (extra tags
allowed; templated role names skipped). Wires the check into main() so
make lint catches violations. 6 new unit tests (29 total, all passing).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -55,7 +55,7 @@ Full design rationale: `docs/decisions/`
   (Ansible inherits it to every task). Tag a task/block with a concern tag from the
   approved list (`tests/tags.yml`) only where it genuinely belongs to that concern —
   don't invent tags or tag for tagging's sake. Target one axis at a time (role/service
-  *or* concern; tags are union/OR, never intersected). `make lint` enforces the vocabulary.
+  *or* concern; tags are union/OR, never intersected). `make lint` enforces the vocabulary and that each role import carries its role-name tag.
 - **Handlers**: use `listen:` topic strings, not direct name references
 - **Variables**: `rolename__varname` double-underscore namespace for role defaults
 - **No inline vars in playbooks**: use `group_vars/` or `host_vars/` only

docs/decisions/019-tagging.md

@@ -91,6 +91,7 @@ opt-in/playbook tags. `scripts/check-tags.py` (run by `make lint`, covered by
 `tests/test_check_tags.py`) scans `roles/` and `playbooks/` and fails on any tag
 outside `{role directory names} ∪ {tests/tags.yml entries}`.
 Molecule scenario files (`roles/*/molecule/**`) are excluded from the scan — they are test orchestration, not the production run-targeting surface this standard governs.
+It also checks that every role imported in a play's `roles:` block carries its own role name as a tag (additional tags are allowed).
 
 ## Extending the vocabulary
 
@@ -104,7 +105,7 @@ leaves a paper trail.
 - Targeted runs are predictable: only two kinds of tags exist, one of them mechanical.
 - Over-tagging is structurally resisted (closed list + lint enforcement).
 - Intersection targeting is unavailable by design.
-- Authors must keep role tags = role names. The linter enforces the *vocabulary* (every tag must be a known role name or an approved tag); the role-tag-equals-role-name rule itself is a convention the linter does not separately check.
+- Authors must keep role tags = role names. `make lint` enforces both the *vocabulary* (every tag is a known role name or approved tag) and that each role import in a `roles:` block carries its own role-name tag (extra tags allowed).
 
 ## Related
 

scripts/check-tags.py

@@ -7,6 +7,9 @@ Allowed set = {role directory names under roles/} ∪ {concerns, special, opt_in
 playbooks from tests/tags.yml}. Templated tags (containing "{{") are skipped —
 they can't be statically validated.
 
+It also checks that every role imported in a play's roles: block carries its own
+role name as a tag (extra tags allowed); ADR-019.
+
 Usage:  python3 scripts/check-tags.py
 Exit 0 = all tags allowed; exit 1 = unknown tag(s) found.
 """
@@ -76,6 +79,47 @@ def scan_text(text):
     return found
 
 
+def _role_entry(entry):
+    """Return (role_name, tags_set) for a roles: list entry, or (None, set()) to skip."""
+    if isinstance(entry, str):
+        return (entry if _static_str(entry) else None, set())
+    if isinstance(entry, dict):
+        name = entry.get("role")
+        if not _static_str(name):
+            return (None, set())
+        tags_value = entry.get("tags")
+        tags = set()
+        if _static_str(tags_value):
+            tags.add(tags_value)
+        elif isinstance(tags_value, list):
+            tags.update(t for t in tags_value if _static_str(t))
+        return (name, tags)
+    return (None, set())
+
+
+def _walk_roles(node, problems):
+    if isinstance(node, dict):
+        roles = node.get("roles")
+        if isinstance(roles, list):
+            for entry in roles:
+                name, tags = _role_entry(entry)
+                if name is not None and name not in tags:
+                    problems.append((name, sorted(tags)))
+        for value in node.values():
+            _walk_roles(value, problems)
+    elif isinstance(node, list):
+        for item in node:
+            _walk_roles(item, problems)
+
+
+def role_tag_problems(text):
+    """Role imports (roles: blocks) whose tags don't include their own role name."""
+    problems = []
+    for doc in yaml.load_all(text, Loader=_IgnoreUnknownTags):
+        _walk_roles(doc, problems)
+    return problems
+
+
 def iter_yaml_files(repo=REPO, scan_dirs=SCAN_DIRS):
     for name in scan_dirs:
         base = repo / name
@@ -96,25 +140,42 @@ def find_violations(used, allowed):
 
 def main():
     allowed = load_vocab() | role_names()
-    violations = []
+    vocab_violations = []
+    role_tag_issues = []
     for path in iter_yaml_files():
+        text = path.read_text()
         try:
-            used = scan_text(path.read_text())
+            used = scan_text(text)
         except yaml.YAMLError as exc:
             print(f"warning: could not parse {path}: {exc}", file=sys.stderr)
             continue
+        rel = path.relative_to(REPO)
         for tag in find_violations(used, allowed):
-            violations.append((path.relative_to(REPO), tag))
+            vocab_violations.append((rel, tag))
+        for name, tags in role_tag_problems(text):
+            role_tag_issues.append((rel, name, tags))
 
-    if violations:
-        print(
-            "error: Ansible tag(s) not in tests/tags.yml or role names "
-            "(see docs/decisions/019-tagging.md):",
-            file=sys.stderr,
-        )
-        for relpath, tag in violations:
-            print(f"  {relpath}: '{tag}'", file=sys.stderr)
-        print(f"\nallowed: {', '.join(sorted(allowed))}", file=sys.stderr)
+    if vocab_violations or role_tag_issues:
+        if vocab_violations:
+            print(
+                "error: Ansible tag(s) not in tests/tags.yml or role names "
+                "(see docs/decisions/019-tagging.md):",
+                file=sys.stderr,
+            )
+            for relpath, tag in vocab_violations:
+                print(f"  {relpath}: '{tag}'", file=sys.stderr)
+            print(f"\nallowed: {', '.join(sorted(allowed))}", file=sys.stderr)
+        if role_tag_issues:
+            print(
+                "error: role import(s) missing their role-name tag "
+                "(ADR-019: import each role with tags: [<rolename>]):",
+                file=sys.stderr,
+            )
+            for relpath, name, tags in role_tag_issues:
+                print(
+                    f"  {relpath}: role '{name}' has tags {tags}, must include '{name}'",
+                    file=sys.stderr,
+                )
         sys.exit(1)
 
     print(f"check-tags: OK ({len(allowed)} tags allowed across {len(SCAN_DIRS)} dirs)")

tests/test_check_tags.py

@@ -83,3 +83,61 @@ def test_iter_yaml_files_skips_molecule(tmp_path):
     names = [p.name for p in found]
     assert "main.yml" in names
     assert "verify.yml" not in names
+
+
+def test_role_tag_problems_flags_missing_name():
+    text = """
+- hosts: all
+  roles:
+    - role: base
+      tags: [firewall]
+"""
+    assert ct.role_tag_problems(text) == [("base", ["firewall"])]
+
+
+def test_role_tag_problems_allows_extra_tags():
+    text = """
+- hosts: all
+  roles:
+    - role: base
+      tags: [base, never]
+"""
+    assert ct.role_tag_problems(text) == []
+
+
+def test_role_tag_problems_flags_bare_dict_import():
+    text = """
+- hosts: all
+  roles:
+    - role: base
+"""
+    assert ct.role_tag_problems(text) == [("base", [])]
+
+
+def test_role_tag_problems_flags_string_form():
+    text = """
+- hosts: all
+  roles:
+    - base
+"""
+    assert ct.role_tag_problems(text) == [("base", [])]
+
+
+def test_role_tag_problems_ok_when_name_present():
+    text = """
+- hosts: all
+  roles:
+    - role: docker_host
+      tags: [docker_host]
+"""
+    assert ct.role_tag_problems(text) == []
+
+
+def test_role_tag_problems_skips_templated_role():
+    text = """
+- hosts: all
+  roles:
+    - role: "{{ dynamic }}"
+      tags: [foo]
+"""
+    assert ct.role_tag_problems(text) == []